Yeah . Flashing Lights always work...I always wanted to build a whole wall of them that did nothing but amaze the observer.. a few wierd audios thrown in there too...


..anyway, as you can see , the tn sig would be a code from the DM module and not related to your problem Those DM codes are gotten from the built-in led [ N59 Emmissioms Module] and that is what brought my attention to your code/module error.

A code 13 on the HFM [ ecu] module means the 02 sensor is running at an upper rich limit, so I would look around for a vac leak ..might want to start at the front plastic vac line running across the front of engine. under the cover..they are notorious on 104s for breaking due to heat fatique.
The othe code from 14 means you have a CTP [ closed throttle position]sw that is not closing all the time ..I would look at the adjustment for this [ you want a little slack in the cable at idle] and I would lube the cable ...this is another common code/problem on 104 HFM/SFI systems ..

I would also go use the built-in reader just to see if any of that info has gotten back to the DM..it can have pending codes in there and not trigger a CE.